JAXRS CXF - get http headers without specifying as method parameters

Question

Is it possible to retrieve http headers inside JAXRS resource method without explicitly specifying these headers as method parameters?

For example I have a following interface:

@Path("/posts")
public interface PostsResource {

  @GET
  public List<Post> getAllPosts();
}

and the following class that implements this interface:

public class PostsResourceImpl implements PostsResource {

  @Autowired
  private PostsService postsService;

  public List<Post> getAllPosts() {
    return postsService.getAllPosts();
  }

}

I don't want to change my method signature to:

public List<Post> getAllPosts(@HeaderParam("X-MyCustomHeader") String myCustomHeader);

This header will be added by interceptor on the client side so the client code doesn't know what to put here and this should not be explicit method parameter.

Answer 1

You can inject an object of type HttpHeaders within your resource as class variable to have access to request headers, as described below:

@Path("/test")
public class TestService {
    @Context
    private HttpHeaders headers;

    @GET
    @Path("/{pathParameter}")
    public Response testMethod() {
        (...)
        List<String> customHeaderValues = headers.getRequestHeader("X-MyCustomHeader");
        System.out.println(">> X-MyCustomHeader = " + customHeaderValues);
        (...)

        String response = (...)
        return Response.status(200).entity(response).build();
    }
}

Hope it answers your question. Thierry